dm_target_linear.c revision 1.3.2.2
1 1.3.2.2 mjf /* $NetBSD: dm_target_linear.c,v 1.3.2.2 2009/01/17 13:28:53 mjf Exp $ */ 2 1.3.2.2 mjf 3 1.3.2.2 mjf /* 4 1.3.2.2 mjf * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 1.3.2.2 mjf * All rights reserved. 6 1.3.2.2 mjf * 7 1.3.2.2 mjf * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 mjf * by Adam Hamsik. 9 1.3.2.2 mjf * 10 1.3.2.2 mjf * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 mjf * modification, are permitted provided that the following conditions 12 1.3.2.2 mjf * are met: 13 1.3.2.2 mjf * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 mjf * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 mjf * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 mjf * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 mjf * documentation and/or other materials provided with the distribution. 18 1.3.2.2 mjf * 19 1.3.2.2 mjf * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 mjf * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 mjf * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 mjf * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 mjf * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 mjf * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 mjf * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 mjf * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 mjf * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 mjf * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 mjf * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 mjf */ 31 1.3.2.2 mjf 32 1.3.2.2 mjf 33 1.3.2.2 mjf /* 34 1.3.2.2 mjf * This file implements initial version of device-mapper dklinear target. 35 1.3.2.2 mjf */ 36 1.3.2.2 mjf 37 1.3.2.2 mjf #include <sys/types.h> 38 1.3.2.2 mjf #include <sys/param.h> 39 1.3.2.2 mjf 40 1.3.2.2 mjf #include <sys/buf.h> 41 1.3.2.2 mjf #include <sys/kmem.h> 42 1.3.2.2 mjf #include <sys/vnode.h> 43 1.3.2.2 mjf 44 1.3.2.2 mjf #include <machine/int_fmtio.h> 45 1.3.2.2 mjf 46 1.3.2.2 mjf #include "dm.h" 47 1.3.2.2 mjf 48 1.3.2.2 mjf /* 49 1.3.2.2 mjf * Allocate target specific config data, and link them to table. 50 1.3.2.2 mjf * This function is called only when, flags is not READONLY and 51 1.3.2.2 mjf * therefore we can add things to pdev list. This should not a 52 1.3.2.2 mjf * problem because this routine is called onyl from dm_table_load_ioctl. 53 1.3.2.2 mjf * @argv[0] is name, 54 1.3.2.2 mjf * @argv[1] is physical data offset. 55 1.3.2.2 mjf */ 56 1.3.2.2 mjf int 57 1.3.2.2 mjf dm_target_linear_init(dm_dev_t *dmv, void **target_config, char *params) 58 1.3.2.2 mjf { 59 1.3.2.2 mjf dm_target_linear_config_t *tlc; 60 1.3.2.2 mjf dm_pdev_t *dmp; 61 1.3.2.2 mjf 62 1.3.2.2 mjf char **ap, *argv[3]; 63 1.3.2.2 mjf 64 1.3.2.2 mjf if(params == NULL) 65 1.3.2.2 mjf return EINVAL; 66 1.3.2.2 mjf 67 1.3.2.2 mjf /* 68 1.3.2.2 mjf * Parse a string, containing tokens delimited by white space, 69 1.3.2.2 mjf * into an argument vector 70 1.3.2.2 mjf */ 71 1.3.2.2 mjf for (ap = argv; ap < &argv[9] && 72 1.3.2.2 mjf (*ap = strsep(¶ms, " \t")) != NULL;) { 73 1.3.2.2 mjf if (**ap != '\0') 74 1.3.2.2 mjf ap++; 75 1.3.2.2 mjf } 76 1.3.2.2 mjf 77 1.3.2.2 mjf /* Insert dmp to global pdev list */ 78 1.3.2.2 mjf if ((dmp = dm_pdev_insert(argv[0])) == NULL) 79 1.3.2.2 mjf return ENOENT; 80 1.3.2.2 mjf 81 1.3.2.2 mjf aprint_debug("Linear target init function called %s--%s!!\n", 82 1.3.2.2 mjf argv[0], argv[1]); 83 1.3.2.2 mjf 84 1.3.2.2 mjf if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_NOSLEEP)) 85 1.3.2.2 mjf == NULL) 86 1.3.2.2 mjf return 1; 87 1.3.2.2 mjf 88 1.3.2.2 mjf tlc->pdev = dmp; 89 1.3.2.2 mjf tlc->offset = 0; /* default settings */ 90 1.3.2.2 mjf 91 1.3.2.2 mjf /* Check user input if it is not leave offset as 0. */ 92 1.3.2.2 mjf tlc->offset = atoi(argv[1]); 93 1.3.2.2 mjf 94 1.3.2.2 mjf *target_config = tlc; 95 1.3.2.2 mjf 96 1.3.2.2 mjf dmv->dev_type = DM_LINEAR_DEV; 97 1.3.2.2 mjf 98 1.3.2.2 mjf return 0; 99 1.3.2.2 mjf } 100 1.3.2.2 mjf 101 1.3.2.2 mjf /* 102 1.3.2.2 mjf * Status routine is called to get params string, which is target 103 1.3.2.2 mjf * specific. When dm_table_status_ioctl is called with flag 104 1.3.2.2 mjf * DM_STATUS_TABLE_FLAG I have to sent params string back. 105 1.3.2.2 mjf */ 106 1.3.2.2 mjf char * 107 1.3.2.2 mjf dm_target_linear_status(void *target_config) 108 1.3.2.2 mjf { 109 1.3.2.2 mjf dm_target_linear_config_t *tlc; 110 1.3.2.2 mjf char *params; 111 1.3.2.2 mjf uint32_t i; 112 1.3.2.2 mjf uint32_t count; 113 1.3.2.2 mjf size_t prm_len; 114 1.3.2.2 mjf 115 1.3.2.2 mjf tlc = target_config; 116 1.3.2.2 mjf prm_len = 0; 117 1.3.2.2 mjf count = 0; 118 1.3.2.2 mjf 119 1.3.2.2 mjf /* count number of chars in offset */ 120 1.3.2.2 mjf for(i = tlc->offset; i != 0; i /= 10) 121 1.3.2.2 mjf count++; 122 1.3.2.2 mjf 123 1.3.2.2 mjf aprint_debug("Linear target status function called\n"); 124 1.3.2.2 mjf 125 1.3.2.2 mjf /* length of name + count of chars + one space and null char */ 126 1.3.2.2 mjf prm_len = strlen(tlc->pdev->name) + count + 2; 127 1.3.2.2 mjf 128 1.3.2.2 mjf if ((params = kmem_alloc(prm_len, KM_NOSLEEP)) == NULL) 129 1.3.2.2 mjf return NULL; 130 1.3.2.2 mjf 131 1.3.2.2 mjf aprint_debug("%s %"PRIu64, tlc->pdev->name, tlc->offset); 132 1.3.2.2 mjf snprintf(params, prm_len,"%s %"PRIu64, tlc->pdev->name, tlc->offset); 133 1.3.2.2 mjf 134 1.3.2.2 mjf return params; 135 1.3.2.2 mjf } 136 1.3.2.2 mjf 137 1.3.2.2 mjf /* 138 1.3.2.2 mjf * Do IO operation, called from dmstrategy routine. 139 1.3.2.2 mjf */ 140 1.3.2.2 mjf int 141 1.3.2.2 mjf dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp) 142 1.3.2.2 mjf { 143 1.3.2.2 mjf dm_target_linear_config_t *tlc; 144 1.3.2.2 mjf 145 1.3.2.2 mjf tlc = table_en->target_config; 146 1.3.2.2 mjf 147 1.3.2.2 mjf /* printf("Linear target read function called %" PRIu64 "!!\n", 148 1.3.2.2 mjf tlc->offset);*/ 149 1.3.2.2 mjf 150 1.3.2.2 mjf bp->b_blkno += tlc->offset; 151 1.3.2.2 mjf 152 1.3.2.2 mjf VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); 153 1.3.2.2 mjf 154 1.3.2.2 mjf return 0; 155 1.3.2.2 mjf 156 1.3.2.2 mjf } 157 1.3.2.2 mjf 158 1.3.2.2 mjf /* 159 1.3.2.2 mjf * Destroy target specific data. Decrement table pdevs. 160 1.3.2.2 mjf */ 161 1.3.2.2 mjf int 162 1.3.2.2 mjf dm_target_linear_destroy(dm_table_entry_t *table_en) 163 1.3.2.2 mjf { 164 1.3.2.2 mjf dm_target_linear_config_t *tlc; 165 1.3.2.2 mjf 166 1.3.2.2 mjf /* 167 1.3.2.2 mjf * Destroy function is called for every target even if it 168 1.3.2.2 mjf * doesn't have target_config. 169 1.3.2.2 mjf */ 170 1.3.2.2 mjf 171 1.3.2.2 mjf if (table_en->target_config == NULL) 172 1.3.2.2 mjf return 0; 173 1.3.2.2 mjf 174 1.3.2.2 mjf tlc = table_en->target_config; 175 1.3.2.2 mjf 176 1.3.2.2 mjf /* Decrement pdev ref counter if 0 remove it */ 177 1.3.2.2 mjf dm_pdev_decr(tlc->pdev); 178 1.3.2.2 mjf 179 1.3.2.2 mjf /* Unbusy target so we can unload it */ 180 1.3.2.2 mjf dm_target_unbusy(table_en->target); 181 1.3.2.2 mjf 182 1.3.2.2 mjf kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); 183 1.3.2.2 mjf 184 1.3.2.2 mjf table_en->target_config = NULL; 185 1.3.2.2 mjf 186 1.3.2.2 mjf return 0; 187 1.3.2.2 mjf } 188 1.3.2.2 mjf 189 1.3.2.2 mjf /* Add this target pdev dependiences to prop_array_t */ 190 1.3.2.2 mjf int 191 1.3.2.2 mjf dm_target_linear_deps(dm_table_entry_t *table_en, prop_array_t prop_array) 192 1.3.2.2 mjf { 193 1.3.2.2 mjf dm_target_linear_config_t *tlc; 194 1.3.2.2 mjf struct vattr va; 195 1.3.2.2 mjf 196 1.3.2.2 mjf int error; 197 1.3.2.2 mjf 198 1.3.2.2 mjf if (table_en->target_config == NULL) 199 1.3.2.2 mjf return ENOENT; 200 1.3.2.2 mjf 201 1.3.2.2 mjf tlc = table_en->target_config; 202 1.3.2.2 mjf 203 1.3.2.2 mjf if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va, curlwp->l_cred)) != 0) 204 1.3.2.2 mjf return error; 205 1.3.2.2 mjf 206 1.3.2.2 mjf prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev); 207 1.3.2.2 mjf 208 1.3.2.2 mjf return 0; 209 1.3.2.2 mjf } 210 1.3.2.2 mjf 211 1.3.2.2 mjf /* 212 1.3.2.2 mjf * Register upcall device. 213 1.3.2.2 mjf * Linear target doesn't need any upcall devices but other targets like 214 1.3.2.2 mjf * mirror, snapshot, multipath, stripe will use this functionality. 215 1.3.2.2 mjf */ 216 1.3.2.2 mjf int 217 1.3.2.2 mjf dm_target_linear_upcall(dm_table_entry_t *table_en, struct buf *bp) 218 1.3.2.2 mjf { 219 1.3.2.2 mjf return 0; 220 1.3.2.2 mjf } 221 1.3.2.2 mjf 222 1.3.2.2 mjf /* 223 1.3.2.2 mjf * Transform char s to uint64_t offset number. 224 1.3.2.2 mjf */ 225 1.3.2.2 mjf uint64_t 226 1.3.2.2 mjf atoi(const char *s) 227 1.3.2.2 mjf { 228 1.3.2.2 mjf uint64_t n; 229 1.3.2.2 mjf n = 0; 230 1.3.2.2 mjf 231 1.3.2.2 mjf while (*s != '\0') { 232 1.3.2.2 mjf if (!isdigit(*s)) 233 1.3.2.2 mjf break; 234 1.3.2.2 mjf 235 1.3.2.2 mjf n = (10 * n) + (*s - '0'); 236 1.3.2.2 mjf s++; 237 1.3.2.2 mjf } 238 1.3.2.2 mjf 239 1.3.2.2 mjf return n; 240 1.3.2.2 mjf } 241
Indexes created Tue Sep 30 20:09:53 GMT 2025